Consequences of disabling MAF on 2.5 Diesel

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Just unplug it and run it for a month or so, checking mpg and paying attention to how it runs in various road conditions as I am, I will also have the emissions checked at an MOT centre to compare with the last reading. I will report back with results later.
 
Jovial John said:
The MAF does not monitor the operation of the EGR, it is fitted up stream of the EGR, which therefore has no sense of EGR operation, it signals to the ECM the volume and temperature of the air passing through it to the manifold via the turbo then through the intercooler then the EGR, the ECM uses this information to decide whether to add exhaust gas via the EGR and to what extent + the fuel quantity required as indicated by the various other sensors such as road speed and accelerator pedal etc. The MAF sends only, it receives no instructions from any source, also it's signals sent are unaffected by turbo pressure, which is further down stream and therefore only affect MAP.
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It supplies airflow info to the ECU to control EGR. The change in airflow through the MAF tells the ECU how much exhaust gas is being ingested at any particular time when EGR is working. The ECU then modulates the EGR control solenoid to increase or decrease to suit requirements.
 
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wammers if you prefer to be offensive, be my guest, but do two things as well, learn to read and learn to understand, then read the official workshop manual.
 
Jovial John said:
wammers if you prefer to be offensive, be my guest, but do two things as well, learn to read and learn to understand, then read the official workshop manual.
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Don't try to teach your granny to suck eggs. I have forgotten more about diesel engines than you will ever learn. I have read it it is not correct.
 
If you're my Granny, congratulations on receiving your card from the Queen and enjoy your remaining years with us. Obviously this must be some of what you've forgotten, don't presume you know more than others when you know nothing about them, your arrogance says it all, I've met and dealt with "experts" in all fields during my lifetime, medical, legal, criminal, builders, plumbers, electricians, electronics, IT and motor mechanics and my own profession. They all have indicated that those that are truly expert, are in the minority, the majority doing the minimum to draw their wages. End of communication, signing off, returning to the adult forum.
 
wammers said:
It supplies airflow info to the ECU to control EGR. The change in airflow through the MAF tells the ECU how much exhaust gas is being ingested at any particular time when EGR is working. The ECU then modulates the EGR control solenoid to increase or decrease to suit requirements.
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Since the MAF is some one metre or more upstream of the EGR and the other side of a compresor driven by the exhaust which is fuel dependent, it would be interesting the hear how it detects a 20 second burst (your figure) of exhaust gas being injected into the exhaust manifold.
 
Datatek said:
Since the MAF is some one metre or more upstream of the EGR and the other side of a compresor driven by the exhaust which is fuel dependent, it would be interesting the hear how it detects a 20 second burst (your figure) of exhaust gas being injected into the exhaust manifold.
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The EGR modulation works in 20 second cycles. When EGR is working modulation is adjusted as required every 20 seconds. Please know what you are talking about. Admittedly it does not help when RAVE confuses the situation by talking about both systems at the same time and giving contrary information by mixing component descriptions. Take the pipe off the EGR valve and run the engine at a steady speed above idle, put a finger over in end of the pipe, you should feel the vacuum being applied to the end of your finger.
 
wammers said:
The EGR modulation works in 20 second cycles. When EGR is working modulation is adjusted as required every 20 seconds. Please know what you are talking about. Admittedly it does not help when RAVE confuses the situation by talking about both systems at the same time and giving contrary information by mixing component descriptions. Take the pipe off the EGR valve and run the engine at a steady speed above idle, put a finger over in end of the pipe, you should feel the vacuum being applied to the end of your finger.
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I'm sure you can, but can you detect any mesurable difference in airflow through the MAF with the EGR connected in the same situation.
Bosch agree with the final version of RAVE.
 
Jovial John said:
If you're my Granny, congratulations on receiving your card from the Queen and enjoy your remaining years with us. Obviously this must be some of what you've forgotten, don't presume you know more than others when you know nothing about them, your arrogance says it all, I've met and dealt with "experts" in all fields during my lifetime, medical, legal, criminal, builders, plumbers, electricians, electronics, IT and motor mechanics and my own profession. They all have indicated that those that are truly expert, are in the minority, the majority doing the minimum to draw their wages. End of communication, signing off, returning to the adult forum.
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On this subject i know a lot more than you. The confusion comes from the Land rover technical writer getting his knickers in a twist and confusing two different systems. If you know so much why bother asking questions then. Just sort it yourself from your vast knowledge. Bloody idiot.
 
Datatek said:
I'm sure you can, but can you detect any mesurable difference in airflow through the MAF with the EGR connected in the same situation.
Bosch agree with the final version of RAVE.
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The MAF sensor is there to give feedback to the ECU reference airflow to control the rate of EGR as opposed to an earlier version of EGR without feedback control. It complies with EC level 2 emission standards. As i have said before you believe what you want to to believe.

"1. Sensors: Inaccurate information from the charge pressure sensor, temperature sensor or mass air flow sensor, although it has no direct influence on the air supply, can cause the DDE control unit to misinterpret air conditions."

BMWs words not mine.
 
Jovial John said:
wammers if you prefer to be offensive, be my guest, but do two things as well, learn to read and learn to understand, then read the official workshop manual.
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Where is the offensive comments.....before this one that is? :rolleyes:

Jovial John said:
If you're my Granny, congratulations on receiving your card from the Queen and enjoy your remaining years with us. Obviously this must be some of what you've forgotten, don't presume you know more than others when you know nothing about them, your arrogance says it all, I've met and dealt with "experts" in all fields during my lifetime, medical, legal, criminal, builders, plumbers, electricians, electronics, IT and motor mechanics and my own profession. They all have indicated that those that are truly expert, are in the minority, the majority doing the minimum to draw their wages. End of communication, signing off, returning to the adult forum.
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Some folk don't try very hard to live up to their forum names do they :D:D
 
blue beasty said:
Where is the offensive comments.....before this one that is? :rolleyes:



Some folk don't try very hard to live up to their forum names do they :D:D
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Pity really with his vast knowledge of everything he could have been a positive asset in other sections of the forum. But may have been a slight let down in the diesel engine sections. :D
 
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